Railway braking apparatus



Filed Jne 20. 1928 then V'point I outthe' novebfea'tnres thereof in.

ventionf- .az. .I

therewith* are two braking bars 2 and Simi- Patented Mar. 11, 1930 f 'apgnimi'aieiiiune 29,15

My inventionrelates to railway braking ap-v paratus, and :particularly tov apparatus' ofthe type-comprising a' braking bar; located in the?A- trackway :and anotor`v for moving suclilbar -vinto engagement 'with' ai part 'ofa railway" ve`` S hicle.' nMore'p'articulai'ly-'iny invention relates tone/an'sfr controlling s'uchlrnotordevice;v

I will'desicribeone form of railway braking apparatus 'embodying'my invention,V andwill 1 Phe accompanying' drawing is a view',p'art' ly ;diagranimatie,. 'illustrating onel form f ofr railwayiniaking apparatus embodying my in- Referring l"to the. drawing, A,the reference characters'l and l? 'designate the 'track rails cfa stretch of railway-track: f Located'on oppositesides of rail 1 and extendingparallel lar braking bars 2fl and 3a extend parallel with rail f1aon bpposite sides thereof.` i

The braking bars 2, 3, 2a4 and Ba'are operated bymJ fluidlpressure motor designated in gen- 'eral'by thereference character M.v This mof tor, in'theforml here shown, comprises acylinder 5 containing Va reciprocable piston 6. The braking bars'2, 3, 2a and 3 are operative# ly connected with-the piston 6 through a resil- 'ient linkage indicated diagrammatically on the drawing andincluding two springs 25 and 25a and a'lever epivoted at point Lia. When piston 6 occupies its left-hand position, the braking bars occupy their non-braking positions in which they are illustrated in the drawing. lVhen piston 6 is' moved to its right-hand position, however, the braking bars are 1 moved inwardly toward the Vassociated rails to their braking positions in vwhich they engage the sides of the wheels of a railwayvehicle traversing rails 1 andfla.' The mechanical apparatus connecting the piston 6 with the braking bars 'forms no part of my present invention and isindicated diao'rainmatically for the sake of simplicity. ne form of apparatus for 'Operating trackway braking bars in the manner described is disclosed in Letters Patent of the United States,iNo.vl,626,9l9, issuedMayB, 1927, to John P. Coleman, for

HERBERTIIBON'E, oF'swIssvALE, PEivivsYLvNIA,"-'ASSIGN0RTofTIIE ,uNIoN SWITCH' SIGNAL COMPANYQQE swrssv'apn' 'P'aNiv'stvLvliivIn, A ooRronA'rIo'N or rENN- E' y Riernwer 'BRAINGQrraBrs of apparatusfor accomplishing the same re-' sult is rdisclosediIi-ran 'applicationffor' Letf ters-.Patent oli-.the United' States, Serial No. l87,525,iiled Aprily 29,@19'27 by- V VilliamY C.

Mcl/Vhirter, for 'railway braking apparatus.

Thel m'otor' MI isV controlled'by `three inagnet plunger 17 provided with' an armature'Wandn a magnet i Whenma-gnet 8 lis delenergized,"y plunger Zoccupies anupp'erposition iniwhich' the vright-hand end ofcylinder 55 i lis A.conf nec'ted withk atmosphere through: pipe Il and the' braking bars to fth'eir non-.braking lpositlOIlS'm-i' L' l i I Valve E iis somewhat similar to valve F. When magnet 8 of theivalve is de-energized so that plunger 7 occupies its upper position, the left-hand end of cylinder 5 is connected Vwith atmosphere through pipe 12 and port 13.

Vhen magnet 8er valve E is energized, however, plunger 7 is moved downwardly to blank pipe ,12.

' moving the braking bars toward their braking positions. When valve D is Closed and valve E is open, however, the left-hand end of cylinder 5 is connected with atmosphere.

Due to the resilient linkage interposed between the piston'6 and the braking bars, it is Tp0rtm'1'0. When f winding j 8 :,ist p1 energized, i however, .plungerI .7 isa moved downwardly, disconnectingfpipe l1 from port "l0 .and oonnecting this :pipe through port y'9 with' a suit-- ablesource fof iiuid' pressure not shown in the' dra-wing... Wheni'nagnet78-ofNalve "F iis- Venergized, thereforegthe iid pressure sup plied'to the right-handend Vof cylinder 5 4mov'espiston G-to tlie left, thereby'moving i deformation of the springs 25 and 25a then caused by a Vehicle. occupying the rails l and 1a.

The valves D and E are controlled in part by a. circuit controller designatedin general.

by the reference character H and comprising:

a movable plate operatively connected with the piston 6 and provided with two contact.. segments 26 and 28 separated by a member of i insulation 27. The circuit controller Hlalso comprises three fixed contacts 29, 30 and 81.

YVhenthe pistonV 6 .occupies itsllefthazrrclposi-1i tion'7 the-contacts 295 30and: 311all engagetheez segment-'126:1 lVhenfrthe .z pistoni 6i moves to:- the right,A however, the segment-2612x150 mnves.-`

to theright,l andwhen the .pistorr-f6ireaches-F a positionV infwvhichV the=braking .bars-cont trolledn thereby "engage the? Whlaelsao trae veliicle,';contactii29imovesdnto:engagement With thecinSula-tions27, thereby breaking Contact?.x

25294126? Ifthe pistorr'mnvesslightly beyond' this position; the'zcontactr291engagesfsegment 281: i In psimilammlanner; ifithe pistoleairmresi.v a small distancei'l farther 'towazzdrI thearight;

Contact.y engagesaI insulatiom-27 to"- breaka 30 Contact: 36e-2B. Further movement .o-fithei;

piston .toe the: righi-,r2 choses Contact? 30if281=r Finally; when theipistowf'occupies aipnsiiona almosiiatztherenidi ofrts'sstrokectb@thefright;v

Contact 31ierrgagesstlefinsulatiori? torbreakii this position, Contact 33e-2B iiclosedj It bef-rseenrnthereore, .that the positionseioii ipiss-A tori?. Goinz: whiehithe vcont-acts 29@ 301 airdrl separately engage the insulation 27 deiine S;l positiolisfofrthei brakilrgrbarsrwliilti corre- Thee reference? character: K1; designates. an Huid pressure responsive"devicewhiclrinzitliei formzherefshowni comprises aiBouxzdon tube:`V

15:.subjectedttx.therpressureffiirfpipe17c0rmunicating with the left-hand end of .cyliara` der 5a. The lBourdonetube' 15 'controlsaecomtactcl iniA sucht'. manner: 'thate the fcontact' isi 5W clesedsonly viv-henY the pressuresiiritheeleit#' hand?. endtloir the?. cylinderz'exceed a: pref4 determined'flow valuer. x The:- re'ieren'cef: character` G designatesf' manually; operable: selector comprisingL ai.

the'lever'. also engages-icontaeti 'i Ass showin iii thee drawing: all contacts? of: l selectortG: areffopen andsalhoiitheevarlv'essg,

are delenergizedr. Both'.: eirdlofi cylinder-aiarefthereire conneeteotito 'atmos- 6I" phe'rei amid contacto 161i oiide'viceol. issopen'n.

Piston 6 occupies its left-hand position so that contacts 29-26, 30-26 and 31--26 of circuit controller H are all closed, and the braking bars operated by piston 6 occupy their non-braking positions.

Iniexplaining the operation ofthe apparatusd Will'iirst assume Jthat the operator in charge-oi' the selector Gr Wishes to cause a light. brake application. this-result'by moving lever-18 into. engagement with contact 20. Currenttheniiows fronr terminal .B of a suitable source of energy not'shown' in the drawing through contact 18.-.-20- of selectorG, Wire 32 of contact 29-26 of circuit controller H, Wires 33 and 34', and magnet'Soi' valverD Yback to terminal'Gof-the'same source;v Atzthe same-time,`

current flowsifroin 'terminals B over contact" W-i-reiz; andma'gnet oii valve'il'ioterminal C. ValveiEis therefore closedto lolankpipe.t

12; arrdfivalverllissopen tovadmit'fiuidi prescontact 16 oi device K and forces pistonf6ito; the? right thereby ."drving; .'thje'z' braking bars toward: their' brakingpositionss .Y Vhen: the. bars have freached .zafzposition'z im .whichv theyawill engage the Wheels of a vehicle, contactarl 29`-26-:oifcircuit controller H opens; interrupting the eircuitlfr magnetfl of'valve.v D.-andstoppingthefadmission of iuidxto the: CylinderQa Duestoetheinertiaoxtheeniovingy part-s, the vpiston: maya stop-z in:P the@l positiorr' .thereby which' iti then; occupies,l and "in: this case theL circuit for magnet .-85015 'valve'. Fr will .remaiir closed; It Will-usually; happen-,f howeverg that even-iffth'avalive1D.is-closed, the expansiongofp theuiiiiid ralreadyf:suppliedtoethercylinderz 5i Wil'lveausea anfurtherimoyement. rot :the piston .toward-i the .frightasuiiioient i tof f close contact y2Q-..28\:. When this: happens,- currentfiows;

from-.terminali B ffoiver:4 contact 18-'20- '-ofse controller--H,WireS; contact-160i device. K,.

Heaccomplishes I Wire@ 39', Windinggoirelayf R .tof terminalC.'

Relay, R; then.- becomes energized. :to open. its.-

back-. ContactY 36.'. vWhen ,this-occurs; the; cir-y cuiiiir'.r magnetSfoevalvefE opens so: that' this: valve -exhaustsiluidxfrom the left-hand endet-cylinder 5.1 ,Theiresulting,.pressure-ere duction continues untill.y the pressurein thel. lett-,handend .oicylinder 5 issbelow the valuerequredtbhbld contaetlot device Kclosed.

Zhen thiscontaet .opens-relay ;Rbeco1nes dev i energizedatherebyg yreestablishingzthe. circuit foie magnet! =& 3ix zalveEr and :preventing ,iurf therie-Xhaust-:oi-,the l-uid fromthe cylinder` A lllndferflthese/icondition'sl lthen, ,the- .piston -is held imposition;Y and i the braking bars` are. inaintazined1in;positions` where they. will be. en-gagedi' by 'aavehicle'--enteringsitherretarder;

The devicezK. is adj-usted; however, toa value' sucl that ithe:A pressure :behind the piston.'isi.so;,

small that therewill'be little or .-no'ltendency i to derail thevehicle as it engages the braking, bars. Ifra vehicle now engages thebraljng Y bars, they are urged toward rtheirnombrakthe left-hand end of cylinder f5 by valve 1),*-

to return the piston to the'position in which'- contact 29 engages the insulation 27. It .willi be seen, therefore, that the .piston is main- 1 tained in the position defined by thecontact 29 and when the piston is in this position'a definite lowbraking force is exerted upon! the wheels ofa vehicle occupying there-1 yfofthe vehicle which enters the retarder. The

tarder.

If the operator wishes to cause amore se''- vere brake application, hemoves lever- 18 intol engagement 'with contact 21." With lever 18 in thisposition', contact 18-24 is still, closed; so that the circuit' for valveE isclosed.` 'l`hex circuit forvalve D, however, now passes Yfrom terminal B, lover Contact v18--21 ofselector 'f G, wil-e140, Contact 30-26, wires 33 and=-34,'

magnet Sof valve-D'to'terminal C.:"=Valve D therefore opens to admit fiuid-tocylinder' 5 and the pistonis moved to therightl until contact30 engages the insulation 27, 'wherethe Huid in thefcylinder moves the pistonto'a' f position into which contact30+28 is` closed, l relay R becomes energized to open the valve l As a result, the pressure in the left-hand end of cylinder 5 is reduced to the low value1 at which the device K operates. When the vehicle enters the retarder, under these conditions, the braking bars are moved back by the wheels of the vehicle against the comparatively low pressure then existing in the lefthand end of cylinder 5. This movement of the piston 6, however, closes contact 30-26, whereupon valve D opens to admit fluid -to the cylinder and restore the piston to the position in which contact 30 engages insulation 27. It follows, therefore, that when contact 18-21 of selector G is closed, the piston 6 held in a position in which contact 30 engages,

insulation 27 and with the parts in this posi- Y tion a greater braking force is obtained than when the piston occupies the position defined by contact 29. y

In similar manner when contact 18--22 of selector G is closed, the valves which control the fluid pressure in the left-hand end of cylinder 5 are controlled by contacts 31--26 and 31-28 of circuit controller H. It follows that when contact 18-22 is closed, the' when lever 18 is moved into engagement with i contactl'23; curre'nt'is, 'supplied directly to` magnet 8 of valveD. over a-circuit Whichpasses from terminal -B .over contact 18-23 offselectorl, wire's42- and 34, vand magnet 8 =of"va1vezD to terminala@` 1 lVhen this cirv cuit .is closed, valve 'D is'h'eld-open independently-ofthe .positionofthe piston 6. Under thesemconditionaf'therbraking bars are vheld ini-.theirrfull .braking'positions by the full pressure applied-to'port 14. f

-It will be rsee", therefore, that the circuit controller H, operated by the piston, permits a-plurality .of braking pressures to be obtained'by controlling the admission of pressureito the cylinderin accordance with the position'of the piston. One advantage of this featureis that=when a vehicle enters the retarderthebraking bars are forced away from their braking positions bythe first truck valve'D isthenliopened tosupplyrto cylinder 5 fluid at suiiicient pressure to restorethe willf'again bei forced.y backand additional fluidwillbera'dinitted to theicylinder to maintain? the Vp'istonwy in l'its fselected position'. It

will .befseen therefore.1 that the unit pressure v on= eachzawheel` 'ofthe vehicle isi maintained substantially constant, the total pressure on the .wheelsfoffthe 'vehicle increasing as addiupon the circuit formagnet 8 is 'interrupted and valve D is closed. If the 'expansion of= selector G is inoved from a position correspending-to a highbraking force to a position corresponding to a lower braking force, the controlof the pressure through the cylinder follows this movement of the selector directly. Thus, if the selector is in av position in which contact 18-22 is closed so that the pistion is held in a position in which contact 31 engages the insulation 27, and the operator wishes to 'reduce the braking pressure to the value corresponding toA Contact 18--20 of the selector, he may do so by simply moving the selector to close contact 18-20. The control circuit for valve D is then shifted to Contact 29-26 of circuit controller H but contact 29 now engages segment 2S and the relay R therefore becomes energized to open valve E, and exhaust fluid from the cylinder5. If the wheels of a vehicle are engaging the braking bars these bars will be forced back to open contact 29-28 -when the pressure has been sufciently reduced; The piston G'will thereafter beheld in the posi- .tion defined by contact 29. It follows, therefore, that the response of the braking appa- CTL cuit. controller responsive, to;th e Condition 02E- ratusftochanges-- inzthe position of seleetonsis instantaneous and automatic.

If the operator- Wishes :to-restore 'theibra-ke ing bars to their non-brakingy positionsfhef. moves lever ,-18 to theiposition -in which; it;is 1 illustrated inthe drawing, thereby opening; all contacts of the selector. As aresult;valve. D is closed and valve :En opens. to exhaust; the left-hand end. of cylinder 5. Theopeiw.. ator then closes Contact:l8-19,1whereupon, current flows fron'rterminal B7. through; oontact l8-19 .of selector G, Wirel; andinagvr net8^of=valve F to terminal C. Plunger 7 ofgvalve F therefore, moves Ldo Wnxvardly-l and lluid pressure isladmittedlto. the rights..4 hand end of Cylinder Piston 6;then-Inoves` tol the left and drives:theibrakingbars toi their, non-braking positions.; The levert-MrV may then Vbegr estoredr tothe position in fwhichr` itis illustrated; in. the;drawing7l wherein-thee circuits for all `vof zthe valves;D,-'EiandaFare.i

Open@I Although I havef-herein shovvn-y andide.. scribed only one form of .railwayabrakingap-- paratus embodying-my invention,I it: is una derstood .that; -various changes and modificaV tions may -befmadeetherein Withnfthe scopes 0f thefappendeda claims; Without departing; from-*theispirit and scopeof invention.

Hayng:thusidesoribedmyjnventionpwhati. I olaimis r 1f., ,Railway ibi-taking,- .apparatus rompi-rising! a braking-bar locatedintheftraeksiray,v a PlSSurefmOtOr forioperatng said bar,- aueirf..:

said motor, anmanllallyimperablef selector; ai.y first magnetl oroontrolliing; tiles-admission oir: fluid to said motor, ai circuit; fon` saidfprstf;4 magnet controlled., byi said ,f seleotonr and by said circuit` controlle r, a second magnetforecontrolling the; exhaustzofflguid rom 'saidg1v1 motor, and a circuit-for said rsecondymagneti; controlled -byqsaidseleotoriand bysaid-.cir euiti. controller.- i

2. Railway braking;apparatusgoomprisingf a braking bar located-in thetrakwayy afifl'li-id'i pressure. motorl forl operatingsaidbar, aioiI-e -v cuit controller responsive to th eeon dition oie.- said motor,A a; manually, operable'i` seleotori, means controlledby, said seleotor for; admit?. ting fluidto said motor, aaeontaot resppn sive to thelpressureinvsaid motor, and means, controlled -by said Contact and by said cireuit 1: controller for exhausting:l luid .fromsa;id motor. l l` v 3i Railway,brakhgapparatus.@uprising. a braking b'arlooatedin the traokfWay-,a cyl'f inder, a' piston reoiprooablein saidoylindn, and operatively 'connected'f' with said bar,` manuallyioontrolled meansf0rl at timesad mitting I luidto saidy Cylinderl to movev the' piston in onedireoti'on--- 'to'A al predetermined" positionfin .itsrstroket meansfeleetive ith' piston moves pastisuclposition irrsaiddirei v tion to reducer the;,pressure: il-insaidcylinder;fy 1

mitting fluid 'ftolsaid amlumeansf eEeet-ive; ifrthei piston.: isa-moved pastrsuohfpositionz in the other direotiontoinereasethepressure in said-cylinder.-

L, Railwaybrakingfapparatus comprising- L blakingfbariloeated infthetrackwa acyl- 70 der-,ga pistonerecproeable-.in said cylinder. and operativelyf conneoted with said bar, manuallylcontrolled meansffor at :times adcylinder toE movev thepis'ton-:inioneidireetion, means for interrupt- 75 ing the; admission; olif uid'zto thecylinder l when; thefpiston -reaoh'esapredetermined postionvinaitse'stroke, andmeans effective 1i tlepston. is moaned-in theopposite directionpastesaid position toi admit luid :toftheoyhn-` S0 l dergtoireturn -theepiston to, said-position;l

5; Railway braking apparatus comprising a brakingfbzmloeated1 .in theitraekway, a, cyl-j inder; a.;pistonreoiproeable in said-cylinder and operatively connected with said bar, S5 meansfifor at ;-,tirnes; adrnitt-ing:1I luid to said Cylinder,-L a. Circuit rcontrollen: responsive tot thepesitonno said pistons and-fmeanseeons trolled-byi saidi oii'eui controllel'foreat; times i exhanstingced fromfsaid'motorr.

GU Rabey fbisaksngeappaatusicomprising' a 'braking bar locatedrimthe trackwaygaicylf. in dr; aepiston-ireciprocableain said cylinders audi operativelyn connected-i with@ saiff bare. meansg :for f atltimeslsadmttingiludctosaid.v 95 Cyliufleriaioirouft cantrollerr-responsvetto l. thepositin oisaid.' pstenf, aecontartfresponn. Silvester thmpnessureynn said cylinder, and;

means entrolledbn Saidslrcuitr controller f anclrbyfsaiif @ontaatdorgalistinaesaexhanstng- 10o fluideirionr said-motora l v v 7:1 Railjvayi:brakiugsapparatusecomprisin-gef a braking)bazideatednitheitralswayr a .eylf nderrfaspston reoiprooable; in fsaid'rcylindn andjopetatively;connetedewith Sfidibari'a; 105, Cireuitfcontrollem commisi-rig.i a plurality.` off Contactsioperated-isuccessvelyiasithe piston mevessthreufghaitssstrekegiamagnet zforfcon: trollingr'theagnsiomioluidzte :sadCyl-nf den andimeauSffen CQntrQ1ling-Sad-magnet-.- nu over-aseletedwnesaidcontasts 8. Railwayibrahingfapparatus; Comprising'.- a bralsngibamleeatedi initheftraekway,Vv a 'cylinder, m p storrireoiprocablein sadylnder; ande o perativebnI commented, Wtbf. said: bar, 115. means: fom atitimesiadmittng iiuid Sto said cylinders af, plurality-5 odi-r contacts; operatedl` sueeessivelynasitha; pistomimoves through :its stroke, Laamagnetori controlling the-exhaust.: olii fluidi;fronesaidioylinderrands;means -.0r-..120; controlling said magnet over a seleeiiedione-i 9.1 Railwayi braking; app a braking ibanlocatedfin theitraekwaiarcylei index2-,a1 pistomreoprooable iinesad Cylinder; 1251* anb operativelyieonnected) with, said-J bar-, means L-on: aizitimeseadmittingf ltiid toisaidz l cylinderyl a pluralitya of contacts operated#` successively .as theipis'tom inoyeathrough itse: stroke, ardeviicefresponsiveitoitherpressurei-inw 1301 said cylinder, a magnet for controlling the exhaust of fluid from said cylinder, and means controlled by said device and by a selected one of said contacts for controlling said magnet.

10. Railway braking apparatus comprising a braking bar located in the trackway, a cylinder, a piston reciprocable in the cylinder, resilient linkage connecting said bar with said piston, means for at times admitting fluid to said cylinder to move said piston in one direction, means operating when the piston reaches a certain position in its stroke to interrupt the admission of fluid to the cylinder, means effective if the piston moves past such position in said one direction to reduce the pressure in said cylinder to a low value, and means operating when the piston is moved past such position to supply fluid to the cylinder to return the piston to said position.

1l. Railway braking apparatus comprising a braking bar located in the trackway, a cylinder, a piston reciprocable in the cylinder, resilient linkage connecting said bar with said piston, a manually operable selector, a manually controlled selector, means for at times admitting fluid to said cylinder to move the piston in one direction, means operating when the piston reaches a selected position in its stroke which depends upon the condition of said selector to interrupt the admission of fluid to said cylinder, means efective if the piston moves past such position in said one direction to reduce the pressure in said cylinder to a low value, and means operating when the piston is moved past such position in the other direction to supply Huid to the cylinder to return the piston to said position.

l2. Railway braking apparatus comprising a braking bar located in the trackway, a fluid pressure motor for operating said bar, and means for controlling the admission of fluid to said motor in accordance with the position of a movable part of said motor.

13. Railway braking apparatus comprising a braking bar located in tlie trackway, a luid pressure motor for operating said bar, a circuit controller responsive to the position of a movable part of said motor, and means controlled by said circuit controller for governing the admission of fluid to said motor.

14;. Railway braking apparatus comprising a braking bar located in the trackway, a fluid pressure motor :for operating said bar, a circuit controller responsive to the position of a movable part of said motor, a manually operable selector, and means controlled by said selector and by said circuit controller for governing the admission of fluid to said motor.

15. Railway braking apparatus comprising a braking bar located in the trackway, a fluid pressure motor for operating said bar,

HERBERT L. BONE. 

